Sh. Jones et al., A BRIEF MENTAL-HEALTH OUTCOME SCALE - RELIABILITY AND VALIDITY OF THEGLOBAL ASSESSMENT OF FUNCTIONING (GAF), British Journal of Psychiatry, 166, 1995, pp. 654-659
Background. The Global Assessment of Functioning (GAF) is a quick and
simple measure of overall psychological disturbance. However, there is
little research on the reliability and validity of this measure in se
verely mentally ill populations. Method. Multidisciplinary keyworkers
assessed 103 patients at monthly intervals over a 6-month period. Over
all GAF scores were obtained, with additional separate ratings for sym
ptoms and disability. These were compared with changes in antipsychiot
ic medication and support needs over the same period. Results. Satisfa
ctory reliability was obtained for total GAF score and for symptom and
disability measures, in spire of raters having only one brief trainin
g session. All GAF scores were associated with current support needs o
f patients. Symptom and disability scores were associated with changes
in antipsychotic medication in the previous month. Only symptom score
was associated with increases in antipsychotic medication at time of
rating. Conclusion. GAF proved to be a reliable and, within the limits
of the indicators used, a valid measure of psychiatric disturbance in
our sample of the severely mentally ill. Differences in relationships
between the three GAF scores and medication/support needs indicate th
e usefulness of obtaining all three scores for monitoring levels and t
ype of psychiatric disturbance in this population.